[dolphin] [Bug 454049] New: Folder icon for folder with image thumbnail is not updated when accent color changes until Dolphin is restarted

[Firlaev-Hans]

https://bugs.kde.org/show_bug.cgi?id=454049

            Bug ID: 454049
           Summary: Folder icon for folder with image thumbnail is not
                    updated when accent color changes until Dolphin is
                    restarted
           Product: dolphin
           Version: 22.04.1
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: firlaevhans.fiete at protonmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 149001
  --> https://bugs.kde.org/attachment.cgi?id=149001&action=edit
Appearance after the accent color is changed but before Dolphin is restarted.
Folder on the left still has old accent color

SUMMARY
When using an icon theme whose folder icons respect the accent color (such as
default Breeze nowadays), the color of folder icons in an open dolphin window
is immediately updated when the accent color changes, but not if said folder
icon has a thumbnail preview for the files inside it on it. See screenshot.

STEPS TO REPRODUCE
1. Use Breeze icons. 
2. Have one folder that contains an image and thus generates a thumbnail, and
one that does not.
3. Change the accent color and be disappointed
4. Restart Dolphin

OBSERVED RESULT
The color of "normal" folder icons (like the one on the right in my screenshot)
updates as expected.
The color of folder icons featuring thumbnails for the pictures inside the
folder (like the one on the left in my screenshot) is not updated until Dolphin
is restarted.

EXPECTED RESULT
When the accent color changes, the folders with thumbnails need to be updated
too. That likely means regenerating the thumbnail for that folder on the fly.

SOFTWARE/OS VERSIONS
KDE Neon Unstable
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.95
Qt Version: 5.15.4

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